how to set z_probe_gap?

I have a delta with Repetier firmware 0.92.9
I am going through the steps to activate z probing. I don't understand how to determine the value for z_probe_gap. 

The documentation states that you start with a guessed bed height which has been set in firmware.   What variable is this?



  • z length is the printer height used. Autoleveling adjust this variable.
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